The couple's son was admitted at government hospital in Pratapgarh in critical condition on Saturday and eventually died in the wee hours on Sunday.
The body was sent to the morgue for post-mortem, which was to be conducted in the morning, but his wailing mother refused to part with her child and the impatient peon Ram Pratap Dhobi locked them inside and went to sleep.
Chhotu, a 10-year-old boy in Haro village under Peepal Khoont police station had fallen from a tree while playing and was severely injured.
The doctors on duty sent the body to the mortuary for autopsy around 4 am.
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The child's parents Ramesh Meena and Rakmi followed them and when the peon asked them to go out so that he could lock the door, the mother refused to leave the child's body.
The peon let them stay inside and locked the door and went away.
Around 7.30 am when authorities were informed of the incident, they quickly unlocked the couple who were then allowed to take the body without post-mortem.
"It is neither advisable nor permissible that any living person be locked inside the mortuary under any circumstances. If the couple was not ready to leave the body, the employee should have reported the matter to his seniors. We have suspended the employee and put him on awaited posting order (APO)," CMHO Dr Radhey Shyam Kachhawa said.